Brüssel, Bibliothèque royale de Belgique, Ms IV 922

Choirbook containing Masses, Motets and Hyms by various composers such as van Weerbecke, de la Rue, Mouton, Josquin…. Facsimile published by Alamire Foundation Please note their terms of use!!
September 2015
http://www.idemdatabase.org/alamire/items/show/91